pixelstats: enable b4s4 to provide f2fs stats

Bug: 155768618
Test: storage-qa pixel/022

Signed-off-by: Randall Huang <huangrandall@google.com>
Change-Id: Ife123db48ee7ee5ab0b7895d4d8a04d58fb99b87
diff --git a/pixelstats/service.cpp b/pixelstats/service.cpp
index 2e72f44..3a9ba89 100644
--- a/pixelstats/service.cpp
+++ b/pixelstats/service.cpp
@@ -41,6 +41,7 @@
         "c440000.qcom,spmi:qcom,pm660l@3:analog-codec@f000/codec_state",
     .Codec1Path =
         "/sys/devices/platform/soc/a88000.i2c/i2c-0/0-0057/codec_state",
+    .F2fsStatsPath = "/sys/fs/f2fs/",
 };
 
 int main() {